netdev - [PATCH] net: phy: enhance GPY115 loopback disable function

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Date:   Fri, 24 Sep 2021 17:05:37 +0800
From:   Xu Liang <lxu@...linear.com>
To:     <andrew@...n.ch>, <hkallweit1@...il.com>, <netdev@...r.kernel.org>,
        <davem@...emloft.net>, <kuba@...nel.org>,
        <vee.khee.wong@...ux.intel.com>
CC:     <linux@...linux.org.uk>, <hmehrtens@...linear.com>,
        <tmohren@...linear.com>, <mohammad.athari.ismail@...el.com>,
        Xu Liang <lxu@...linear.com>
Subject: [PATCH] net: phy: enhance GPY115 loopback disable function

GPY115 need reset PHY when it comes out from loopback mode if the firmware
version number (lower 8 bits) is equal to or below 0x76.

Signed-off-by: Xu Liang <lxu@...linear.com>
---
 drivers/net/phy/mxl-gpy.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index 2d5d5081c3b6..3ef62d5c4776 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -493,6 +493,32 @@ static int gpy_loopback(struct phy_device *phydev, bool enable)
 	return ret;
 }
 
+static int gpy115_loopback(struct phy_device *phydev, bool enable)
+{
+	int ret;
+	int fw_minor;
+
+	if (enable)
+		return gpy_loopback(phydev, enable);
+
+	/* Show GPY PHY FW version in dmesg */
+	ret = phy_read(phydev, PHY_FWV);
+	if (ret < 0)
+		return ret;
+
+	fw_minor = FIELD_GET(PHY_FWV_MINOR_MASK, ret);
+	if (fw_minor > 0x0076)
+		return gpy_loopback(phydev, 0);
+
+	ret = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, BMCR_RESET);
+	if (!ret) {
+		/* Some delay for the reset complete. */
+		msleep(100);
+	}
+
+	return ret;
+}
+
 static struct phy_driver gpy_drivers[] = {
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_GPY2xx),
@@ -527,7 +553,7 @@ static struct phy_driver gpy_drivers[] = {
 		.handle_interrupt = gpy_handle_interrupt,
 		.set_wol	= gpy_set_wol,
 		.get_wol	= gpy_get_wol,
-		.set_loopback	= gpy_loopback,
+		.set_loopback	= gpy115_loopback,
 	},
 	{
 		PHY_ID_MATCH_MODEL(PHY_ID_GPY115C),
@@ -544,7 +570,7 @@ static struct phy_driver gpy_drivers[] = {
 		.handle_interrupt = gpy_handle_interrupt,
 		.set_wol	= gpy_set_wol,
 		.get_wol	= gpy_get_wol,
-		.set_loopback	= gpy_loopback,
+		.set_loopback	= gpy115_loopback,
 	},
 	{
 		.phy_id		= PHY_ID_GPY211B,
-- 
2.17.1